PREMIUM MATERIAL: The chuck is forged from high-quality steel, with high hardness, not easy to break, high precision, strong and durable. The black rubber boot eliminates the possibility of rust, and its compact body and ergonomic design are more suitable for carrying and rotating. ADVANTAGES: The collet bit is convenient and quick to use when you need to change bits from different specifications. It is flexible to use and can change various electric drills at will. A simple accessory can enable your machine to perform multiple functions, eliminating the cost and time of buying multiple tools. WARM TIPS: Please do not use it counterclockwise. Please check if this light is suitable for your electric hand drill before purchasing. Specific parameters and size data have been marked in the picture and description. WIDE APPLICATION: This keyless chuck is a multifunctional product, suitable for almost all brands of electric hammers and wrenches. You can quickly replace bits of different specifications to facilitate drilling operations in different conditions and materials. Specification: Threaded mounting: 1/2"-20 UNF Chuck Adapter Thread: 1/2" Clamping Range: 2-13mm Size: Shown as pictures Package weight: approx. 260g / 9.2oz Package List: 1 Chuck 1 Chuck Adapter Note: Please allow slight error due to manual measurement. Thanks for your understanding.